New
Description
Keep consistent coolant temperature to all six cylinders in your 2003–2005 Dodge 5.9L Cummins (with automatic transmission) by installing the Fleece Coolant Bypass Kit. The factory cooling system can manage stock conditions, but performance upgrades can overwhelm it—leading to poor flow to the rear cylinders, higher temperatures, and excessive pressure that can cause freeze plugs to fail. This kit uses a temperature-activated secondary thermostat instead of relying on pressure, ensuring even cooling across all cylinders before any issue arises. The complete package includes high-quality O‑ring fittings and AN hose connections, with your choice of braided stainless steel or braided black nylon hose for a secure, leak-free install.
Features:
- Installation does not require cylinder head removal
- Temperature-activated secondary thermostat improves flow control
- Maintains consistent coolant temperature across all cylinders
- Available with braided black nylon or braided stainless steel hose options
- Backed by a 1-year limited warranty
- Eliminates the factory transmission fluid heat exchanger for simplified plumbing